Cannot build: Qt 4.8.1, Linux, error in qdrawhelper_sse2.cpp

Hi All,
Perhaps someone can see the obvious problem with my attempt to build Qt 4.8.1 (or 4.8.0) on Linux using GCC.

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$ make confclean
$ ./configure --prefix=/mnt/data/qt/qt-4.8.1 -plugin-sql-sqlite -opensource
--- 8< -- snip --
Qt is now configured for building. Just run 'gmake'.
Once everything is built, you must run 'gmake install'.
Qt will be installed into /mnt/data/qt/qt-4.8.1

Using -no-sse2 gets the process to a different failure point that seems related to ssse3. Adding -no-ssse3 gets me to more errors implying there might be some undesirable crossover with the system-wide Qt install (4.7.4).

I also found https://bugreports.qt-project.org/browse/QTBUG-14443 with an almost identical symptom caused by some private headers being installed system wide. Gentoo does this:
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private-headers : Install Qt declarative private headers required by Qt-creator
QmlDesigner and QmlInspector plugins
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